文章目录
一、ESP32-D2WD芯片
1. ESP32-D2WD特殊引脚查询表&注意事项
| 引脚名 | 芯片No. | 电源 | 是否建议使用 | 原因 |
|---|---|---|---|---|
| GPIO0 | 23 | VDD3P3_RTC | 不优先 | Strapping Pins* 用于切换Booting Mode 复位完成后可以正常使用 |
| GPIO2 | 22 | VDD3P3_RTC | 不优先 | Strapping Pins* 用于切换Booting Mode 复位完成后可以正常使用 |
| GPIO5 | 34 | VDD3P3_CPU | 不优先 | Strapping Pins* 与MTDO 用于切换Timing of SDIO Slave |
| GPIO12 /MTDI | 18 | VDD3P3_RTC | 不优先 | Strapping Pins* 用于确认flash工作电压 1:1.8v 0:3.3v(default) |
| GPIO15 /MTDO | 21 | VDD3P3_RTC | 不优先 | Strapping Pins* 时钟相关 |
| GPIO16* | 25 | VDD_SDIO | 不建议 | 需查阅模组原理图 GPIO16 和 GPIO17 SD_CMD, SD_CLK, SD_DATA_0 SD_DATA_1 用于外接flash |
| GPIO17* | 27 | VDD_SDIO | 不建议 | 需查阅模组原理图 同上 （该引脚电压与flash供电电压一致） |
| GPIO 34 /VDET_1 | 10 | VDD3P3_RTC | 不建议 | 只能作为输入引脚 |
| GPIO 35 /VDET_2 | 11 | VDD3P3_RTC | 不建议 | 只能作为输入引脚 |
| GPIO 36 /SENSOR_VP | 5 | VDD3P3_RTC | 不建议 | 只能作为输入引脚 |
| GPIO 37 /SENSOR_CAPP | 6 | VDD3P3_RTC | 不建议 | 只能作为输入引脚 |
| GPIO 38 /SENSOR_CAPN | 7 | VDD3P3_RTC | 不建议 | 只能作为输入引脚 |
| GPIO 39 /SENSOR_VN | 8 | VDD3P3_RTC | 不建议 | 只能作为输入引脚 |
- ESP32 has five strapping pins: • MTDI • GPIO0 • GPIO2 • MTDO • GPIO5
- 注意GPIO16、GPIO17在ESP32-WROOM-32D模组中并没有用于连接flash，且该模组flash为3.3v，所以能够在没有其他IO资源的情况下使用。
In most cases, the data port connection between the ESP32 and external flash is as follows: SD_DATA0/SPIQ =IO1/DO, SD_DATA1/SPID = IO0/DI, SD_DATA2/SPIHD = IO3/HOLD#, SD_DATA3/SPIWP = IO2/WP#.
2. ESP32-D2WD芯片封装
3. ESP32-D2WD芯片引脚定义
| Name | No. | Type | Function |
|---|---|---|---|
| - | - | - | Analog |
| VDDA | 1 | P | Analog power supply (2.3V – 3.6V) |
| LNA_IN | 2 | I/O | RF input and output |
| VDD3P3 | 3 | P | Analog power supply (2.3V – 3.6V) |
| VDD3P3 | 4 | P | Analog power supply (2.3V – 3.6V) |
| - | - | - | VDD3P3_RTC |
| SENSOR_VP | 5 | I | GPIO36, ADC1_CH0, RTC_GPIO0 |
| SENSOR_CAPP | 6 | I | GPIO37, ADC1_CH1, RTC_GPIO1 |
| SENSOR_CAPN | 7 | I | GPIO38, ADC1_CH2, RTC_GPIO2 |
| SENSOR_VN | 8 | I | GPIO39, ADC1_CH3, RTC_GPIO3 |
| CHIP_PU | 9 | I | High: On; enables the chip Low: Off; the chip powers off Note: Do not leave the CHIP_PU pin floating |
| VDET_1 | 10 | I | GPIO34, ADC1_CH6, RTC_GPIO4 |
| VDET_2 | 11 | I | GPIO35, ADC1_CH7, RTC_GPIO5 |
| 32K_XP | 12 | I/O | GPIO32, ADC1_CH4, RTC_GPIO9, TOUCH9, 32K_XP (32.768 kHz crystal oscillator input) |
| 32K_XN | 13 | I/O | GPIO33, ADC1_CH5, RTC_GPIO8, TOUCH8, 32K_XN (32.768 kHz crystal oscillator output) |
| GPIO25 | 14 | I/O | GPIO25, ADC2_CH8, RTC_GPIO6, DAC_1, EMAC_RXD0 |
| GPIO26 | 15 | I/O | GPIO26, ADC2_CH9, RTC_GPIO7, DAC_2, EMAC_RXD1 |
| GPIO27 | 16 | I/O | GPIO27, ADC2_CH7, RTC_GPIO17, TOUCH7, EMAC_RX_DV |
| MTMS | 17 | I/O | GPIO14, ADC2_CH6, RTC_GPIO16, TOUCH6, EMAC_TXD2, HSPICLK, HS2_CLK, SD_CLK, MTMS |
| MTDI | 18 | I/O | GPIO12, ADC2_CH5, RTC_GPIO15, TOUCH5, EMAC_TXD3, HSPIQ, HS2_DATA2, SD_DATA2, MTDI |
| VDD3P3_RTC | 19 | P | Input power supply for RTC IO (2.3 V – 3.6 V) |
| MTCK | 20 | I/O | GPIO13, ADC2_CH4, RTC_GPIO14, TOUCH4, EMAC_RX_ER, HSPID, HS2_DATA3, SD_DATA3, MTCK |
| MTDO | 21 | I/O | GPIO15, ADC2_CH3, RTC_GPIO13, TOUCH3, EMAC_RXD3, HSPICS0, HS2_CMD, SD_CMD, MTDO |
| GPIO2 | 22 | I/O | GPIO2, ADC2_CH2, RTC_GPIO12, TOUCH2, HSPIWP, HS2_DATA0, SD_DATA0 |
| GPIO0 | 23 | I/O | GPIO0, ADC2_CH1, RTC_GPIO11, TOUCH1, EMAC_TX_CLK,CLK_OUT1, |
| GPIO4 | 24 | I/O | GPIO4, ADC2_CH0, RTC_GPIO10, TOUCH0, EMAC_TX_ER, HSPIHD, HS2_DATA1, SD_DATA1 |
| - | - | - | VDD_SDIO |
| GPIO16 | 25 | I/O | GPIO16, HS1_DATA4, U2RXD, EMAC_CLK_OUT |
| VDD_SDIO | 26 | P | Output power supply: 1.8 V or the same voltage as VDD3P3_RTC |
| GPIO17 | 27 | I/O | GPIO17, HS1_DATA5, U2TXD, EMAC_CLK_OUT_180 |
| SD_DATA_2 | 28 | I/O | GPIO9, HS1_DATA2, U1RXD, SD_DATA2, SPIHD |
| SD_DATA_3 | 29 | I/O | GPIO10, HS1_DATA3, U1TXD, SD_DATA3, SPIWP |
| SD_CMD | 30 | I/O | GPIO11, HS1_CMD, U1RTS, SD_CMD, SPICS0 |
| SD_CLK | 31 | I/O | GPIO6, HS1_CLK, U1CTS, SD_CLK, SPICLK |
| SD_DATA_0 | 32 | I/O | GPIO7, HS1_DATA0, U2RTS, SD_DATA0, SPIQ |
| SD_DATA_1 | 33 | I/O | GPIO8, HS1_DATA1, U2CTS, SD_DATA1, SPID |
| - | - | - | VDD3P3_CPU |
| GPIO5 | 34 | I/O | GPIO5, HS1_DATA6, VSPICS0, EMAC_RX_CLK |
| GPIO18 | 35 | I/O | GPIO18, HS1_DATA7, VSPICLK |
| GPIO23 | 36 | I/O | GPIO23, HS1_STROBE, VSPID |
| VDD3P3_CPU | 37 | P | Input power supply for CPU IO (1.8 V – 3.6 V) |
| GPIO19 | 38 | I/O | GPIO19, U0CTS, VSPIQ, EMAC_TXD0 |
| GPIO22 | 39 | I/O | GPIO22, U0RTS, VSPIWP, EMAC_TXD1 |
| U0RXD | 40 | I/O | GPIO3, U0RXD, CLK_OUT2 |
| U0TXD | 41 | I/O | GPIO1, U0TXD, CLK_OUT3, EMAC_RXD2 |
| GPIO21 | 42 | I/O | GPIO21, VSPIHD, EMAC_TX_EN |
| - | - | - | Analog |
| VDDA | 43 | P | Analog power supply (2.3 V – 3.6 V) |
| XTAL_N | 44 | O | External crystal output |
| XTAL_P | 45 | I | External crystal input |
| VDDA | 46 | P | Analog power supply (2.3 V – 3.6 V) |
| CAP2 | 47 | I | Connects to a 3 nF capacitor and 20 kΩ resistor in parallel to CAP1 |
| CAP1 | 48 | I | Connects to a 10 nF series capacitor to ground |
| GND | 49 | P | Ground |
二、ESP32-WROOM-32D模组
ESP32-WROOM-32D（或32U）模组内置ESP32-D0WD双核芯片，40MHz晶振，32Mbit 3.3V flash 和板载天线。
1. ESP32-WROOM-32D模组特殊引脚&注意事项
- 遵循第一节ESP32-D2WD特殊引脚查询表&注意事项
2. ESP32-WROOM-32D优先使用引脚
优先>不优先>不建议>禁用
| 引脚名 | 芯片No. | 电源 | 是否建议使用 | 备注/原因 |
|---|---|---|---|---|
| 模组左侧 | - | - | - | - |
| GPIO34* | 10 | VDD3P3_RTC | 不建议 | 仅输入 |
| GPIO35* | 11 | VDD3P3_RTC | 不建议 | 仅输入 |
| GPIO32 | 12 | VDD3P3_RTC | 优先 | |
| GPIO33 | 13 | VDD3P3_RTC | 优先 | |
| GPIO25 | 14 | VDD3P3_RTC | 优先 | |
| GPIO26 | 15 | VDD3P3_RTC | 优先 | |
| GPIO27 | 16 | VDD3P3_RTC | 优先 | |
| GPIO14 | 17 | VDD3P3_RTC | 优先 | MTMS |
| GPIO12* | 18 | VDD3P3_RTC | 不建议 | MTDI 用于选择 flash 电压 |
| 模组下侧 | - | - | - | - |
| GPIO13 | 20 | VDD3P3_RTC | 优先 | MTCK |
| GPIO15* | 21 | VDD3P3_RTC | 不建议 | MTDO |
| GPIO2* | 22 | VDD3P3_RTC | 不建议 | 用于选择 boot mode |
| 模组右侧 | - | - | - | - |
| GPIO23 | 36 | VDD3P3_CPU | 优先 | |
| GPIO22 | 39 | VDD3P3_CPU | 优先 | |
| GPIO21 | 42 | VDD3P3_CPU | 优先 | |
| GPIO19 | 38 | VDD3P3_CPU | 优先 | |
| GPIO18 | 35 | VDD3P3_CPU | 优先 | |
| GPIO5 | 34 | VDD3P3_CPU | 优先 | |
| GPIO17* | 27 | VDD_SDIO | 不优先 | 在该模组中未用于连接flash |
| GPIO16* | 25 | VDD_SDIO | 不优先 | 在该模组中未用于连接flash |
| GPIO4 | 24 | VDD3P3_RTC | 优先 | |
| GPIO0* | 23 | VDD3P3_RTC | 不建议 | 用于选择 boot mode |
3. ESP32-WROOM-32D模组封装
4. ESP32-WROOM-32D模组引脚定义
| 名称 | 编号 | 类型 | 功能 |
|---|---|---|---|
| GND | 1 | P | 接地 |
| 3V3 | 2 | P | 供电 |
| EN | 3 | I | 使能模组，高电平有效。 |
| SENSOR_VP | 4 | I | GPIO36,ADC1_CH0,RTC_GPIO0 |
| SENSOR_VN | 5 | I | GPIO39,ADC1_CH3,RTC_GPIO3 |
| IO34 | 6 | I | GPIO34,ADC1_CH6,RTC_GPIO4 |
| IO35 | 7 | I | GPIO35,ADC1_CH7,RTC_GPIO5 |
| IO32 | 8 | I/O | GPIO32,XTAL_32K_P(32.768kHz晶振输入),ADC1_CH4,TOUCH9,RTC_GPIO9 |
| IO33 | 9 | I/O | GPIO33,XTAL_32K_N(32.768kHz晶振输出),ADC1_CH5,TOUCH8,RTC_GPIO8 |
| IO25 | 10 | I/O | GPIO25,DAC_1,ADC2_CH8,RTC_GPIO6,EMAC_RXD0 |
| IO26 | 11 | I/O | GPIO26,DAC_2,ADC2_CH9,RTC_GPIO7,EMAC_RXD1 |
| IO27 | 12 | I/O | GPIO27,ADC2_CH7,TOUCH7,RTC_GPIO17,EMAC_RX_DV |
| IO14 | 13 | I/O | GPIO14,ADC2_CH6,TOUCH6,RTC_GPIO16,MTMS,HSPICLK,HS2_CLK,SD_CLK,EMAC_TXD2 |
| IO12 | 14 | I/O | GPIO12,ADC2_CH5,TOUCH5,RTC_GPIO15,MTDI,HSPIQ,HS2_DATA2,SD_DATA2,EMAC_TXD3 |
| GND | 15 | P | 接地 |
| IO13 | 16 | I/O | GPIO13,ADC2_CH4,TOUCH4,RTC_GPIO14,MTCK,HSPID,HS2_DATA3,SD_DATA3,EMAC_RX_ER |
| SHD/SD2* | 17 | I/O | GPIO9,SD_DATA2,SPIHD,HS1_DATA2,U1RXD |
| SWP/SD3* | 18 | I/O | GPIO10,SD_DATA3,SPIWP,HS1_DATA3,U1TXD |
| SCS/CMD* | 19 | I/O | GPIO11,SD_CMD,SPICS0,HS1_CMD,U1RTS |
| SCK/CLK* | 20 | I/O | GPIO6,SD_CLK,SPICLK,HS1_CLK,U1CTS |
| SDO/SD0* | 21 | I/O | GPIO7,SD_DATA0,SPIQ,HS1_DATA0,U2RTS |
| SDI/SD1* | 22 | I/O | GPIO8,SD_DATA1,SPID,HS1_DATA1,U2CTS |
| IO15 | 23 | I/O | GPIO15,ADC2_CH3,TOUCH3,MTDO,HSPICS0,RTC_GPIO13,HS2_CMD,SD_CMD,EMAC_RXD3 |
| IO2 | 24 | I/O | GPIO2,ADC2_CH2,TOUCH2,RTC_GPIO12,HSPIWP,HS2_DATA0,SD_DATA0 |
| IO0 | 25 | I/O | GPIO0,ADC2_CH1,TOUCH1,RTC_GPIO11,CLK_OUT1,EMAC_TX_CLK |
| IO4 | 26 | I/O | GPIO4,ADC2_CH0,TOUCH0,RTC_GPIO10,HSPIHD,HS2_DATA1,SD_DATA1,EMAC_TX_ER |
| IO16 | 27 | I/O | GPIO16,HS1_DATA4,U2RXD,EMAC_CLK_OUT |
| IO17 | 28 | I/O | GPIO17,HS1_DATA5,U2TXD,EMAC_CLK_OUT_180 |
| IO5 | 29 | I/O | GPIO5,VSPICS0,HS1_DATA6,EMAC_RX_CLK |
| IO18 | 30 | I/O | GPIO18,VSPICLK,HS1_DATA7 |
| IO19 | 31 | I/O | GPIO19,VSPIQ,U0CTS,EMAC_TXD0 |
| NC | 32 | - | - |
| IO21 | 33 | I/O | GPIO21,VSPIHD,EMAC_TX_EN |
| RXD0 | 34 | I/O | GPIO3,U0RXD,CLK_OUT2 |
| TXD0 | 35 | I/O | GPIO1,U0TXD,CLK_OUT3,EMAC_RXD2 |
| IO22 | 36 | I/O | GPIO22,VSPIWP,U0RTS,EMAC_TXD1 |
| IO23 | 37 | I/O | GPIO23,VSPID,HS1_STROBE |
| GND | 38 | P | 接地 |
5. ESP32-WROOM-32D模组原理图
参考文档：esp32-wroom-32d_esp32-wroom-32u_datasheet_cn.pdf
6. ESP32-WROOM-32D外围原理图参考设计
